How can friction be harmful to a car engine?

A 400 kg object is sitting at rest at the top of a hill that is 30.0m high and 80.0m long measured along the hill. If there is no friction, how fast will the object be going at the bottom of the hill?

Two electronics technicians are discussing conductors and insulators. Technician A says that conductors have more free electrons than insulators. Technician B says that insulators have lower resistance than conductors.

A swing oscillates 8 times in 12 seconds what is its period what is its frequency

Which is NOT true related to the following equation? Fe (NO3) 3 + 3NaOH - > Fe (OH) 3 + 2NaNO3 A This reaction is balanced. . B Sodium nitrate is a product. C Sodium hydroxide is a reactant. D This is a neutralization reaction.

Because of friction A) energy is NOT always conserved. B) NOT all potential energy is converted to kinetic energy. C) all of an object's kinetic energy turns into potential energy.

Steam moves into a cylinder of a steam engine at a constant pressure and does 2.34 J of work on a piston. The diameter of the piston is 3.4 cm and the piston travels 4.6cm. What is the pressure of the steam?

Identify each type of simple machine.

A car's speedometer reads 20 m/s after accelerating, from a standing start, for 25s. What was the magnitude of its acceleration?

What happens to the period of a pendulum and the period of a spring as the amplitude of the oscillation increases? Briefly give an explanation for this relationship.

The element that is most abundant in earth is